There has been a lot of discussion about banks tightening lending. One reason could be that they will no longer raise rates at anytime for any reason. This cuts off a banks ability to increase your rates due to perceived risks. Sometimes the perceived risk is valid such as defaults on multiple other accounts (after all anyone can miss a payment occasionally) but this will out a damper on lenders who raise rates simply because of the anytime any reason clause in their T&Cs (from personal experience I KNOW they are a crock with some companies).
The banks fail to realize that consumers are getting more educated and know that there is always the possibility t better deal. So as punishment, many have been raising rates based on consumers who look for better interest rates with other lenders.